import {
  Button,
  TextField,
  Select,
  MenuItem,
  FormControl,
  InputLabel,
  Box,
} from "@mui/material";
import { observer } from "mobx-react-lite";
import { ArrowLeft, Loader2, Save } from "lucide-react";
import { useNavigate } from "react-router-dom";
import { toast } from "react-toastify";
import {
  stationsStore,
  languageStore,
  cityStore,
  authStore,
  mediaStore,
  isMediaIdEmpty,
  useSelectedCity,
  SelectMediaDialog,
  UploadMediaDialog,
  PreviewMediaDialog,
} from "@shared";
import { useEffect, useState } from "react";
import {
  ImageUploadCard,
  LanguageSwitcher,
  SaveWithoutCityAgree,
} from "@widgets";

export const StationCreatePage = observer(() => {
  const navigate = useNavigate();
  const [isLoading, setIsLoading] = useState(false);
  const { language } = languageStore;
  const {
    createStationData,
    setCreateCommonData,
    createStation,
    setLanguageCreateStationData,
  } = stationsStore;
  const { getCities } = cityStore;
  const canReadCities = authStore.canRead("cities");
  const { selectedCityId, selectedCity } = useSelectedCity();
  const [coordinates, setCoordinates] = useState<string>("");
  const [isSelectMediaOpen, setIsSelectMediaOpen] = useState(false);
  const [isUploadMediaOpen, setIsUploadMediaOpen] = useState(false);
  const [isPreviewMediaOpen, setIsPreviewMediaOpen] = useState(false);
  const [mediaId, setMediaId] = useState("");
  const [activeMenuType, setActiveMenuType] = useState<
    "thumbnail" | "watermark_lu" | "watermark_rd" | "image" | null
  >(null);

  const [isSaveWarningOpen, setIsSaveWarningOpen] = useState(false);

  useEffect(() => {
    if (
      createStationData.common.latitude !== 0 ||
      createStationData.common.longitude !== 0
    ) {
      setCoordinates(
        `${createStationData.common.latitude}, ${createStationData.common.longitude}`
      );
    }
  }, [createStationData.common.latitude, createStationData.common.longitude]);

  const executeCreate = async () => {
    try {
      setIsLoading(true);
      await createStation();
      toast.success("Остановка успешно создана");
      navigate("/station");
    } catch (error) {
      console.error("Error creating station:", error);
      toast.error("Ошибка при создании станции");
    } finally {
      setIsLoading(false);
    }
  };

  const handleCreate = async () => {
    const isCityMissing = !createStationData.common.city_id;

    const isNameMissing =
      !createStationData.ru.name ||
      !createStationData.en.name ||
      !createStationData.zh.name;

    if (isCityMissing || isNameMissing) {
      setIsSaveWarningOpen(true);
      return;
    }

    await executeCreate();
  };

  const handleConfirmCreate = async () => {
    setIsSaveWarningOpen(false);
    await executeCreate();
  };

  const handleCancelCreate = () => {
    setIsSaveWarningOpen(false);
  };

  useEffect(() => {
    const fetchCities = async () => {
      if (!authStore.me) {
        await authStore.getMeAction().catch(() => undefined);
      }
      if (authStore.canRead("cities")) {
        await getCities("ru");
        return;
      }
      await authStore.fetchMeCities().catch(() => undefined);
    };

    fetchCities();
    mediaStore.getMedia();
  }, []);

  const baseCities = canReadCities
    ? cityStore.cities["ru"].data
    : authStore.meCities["ru"].map((city) => ({
        id: city.city_id,
        name: city.name,
        country: "",
        country_code: "",
        arms: "",
      }));

  const availableCities =
    selectedCity?.id && !baseCities.some((city) => city.id === selectedCity.id)
      ? [selectedCity, ...baseCities]
      : baseCities;

  const handleMediaSelect = (media: {
    id: string;
    filename: string;
    media_name?: string;
    media_type: number;
  }) => {
    setCreateCommonData({ icon: media.id });
  };

  const selectedMedia =
    createStationData.common.icon &&
    !isMediaIdEmpty(createStationData.common.icon)
      ? mediaStore.media.find((m) => m.id === createStationData.common.icon)
      : null;
  const effectiveIconUrl = isMediaIdEmpty(createStationData.common.icon)
    ? null
    : selectedMedia?.id ?? createStationData.common.icon;

  useEffect(() => {
    if (selectedCityId && selectedCity && !createStationData.common.city_id) {
      setCreateCommonData({
        city_id: selectedCityId,
        city: selectedCity.name,
      });
    }
  }, [selectedCityId, selectedCity, createStationData.common.city_id]);

  return (
    <Box className="w-full h-full p-3 flex flex-col gap-10">
      <LanguageSwitcher />
      <div className="flex items-center gap-4">
        <button
          className="flex items-center gap-2"
          onClick={() => navigate(-1)}
        >
          <ArrowLeft size={20} />
          Назад
        </button>
      </div>

      <div className="flex flex-col gap-10 w-full items-end">
        <div className="flex gap-10 items-center mb-5 max-w-[80%] self-start">
          <h1 className="text-3xl break-words">Создание остановки</h1>
        </div>
        <TextField
          fullWidth
          label="Название"
          value={createStationData[language].name || ""}
          required
          onChange={(e) =>
            setLanguageCreateStationData(language, {
              name: e.target.value,
            })
          }
        />

        <TextField
          fullWidth
          label="Описание"
          value={createStationData.common.description || ""}
          onChange={(e) =>
            setCreateCommonData({
              description: e.target.value,
            })
          }
        />

        {/* <TextField
          fullWidth
          label="Адрес"
          value={createStationData[language].address || ""}
          onChange={(e) =>
            setLanguageCreateStationData(language, {
              address: e.target.value,
            })
          }
        /> */}

        <TextField
          fullWidth
          label="Координаты"
          value={coordinates}
          onChange={(e) => {
            const newValue = e.target.value;
            setCoordinates(newValue);

            const input = newValue.replace(/,/g, " ").trim();
            const [latStr, lonStr] = input.split(/\s+/);

            const lat = parseFloat(latStr);
            const lon = parseFloat(lonStr);

            const isValidLat = !isNaN(lat);
            const isValidLon = !isNaN(lon);

            if (isValidLat && isValidLon) {
              setCreateCommonData({
                latitude: lat,
                longitude: lon,
              });
            } else {
              setCreateCommonData({
                latitude: 0,
                longitude: 0,
              });
            }
          }}
          placeholder="Введите координаты в формате: широта долгота (можно использовать запятые или пробелы)"
        />

        <FormControl fullWidth>
          <InputLabel>Город</InputLabel>
          <Select
            value={createStationData.common.city_id || ""}
            label="Город"
            onChange={(e) => {
              const selectedCity = availableCities.find(
                (city) => city.id === e.target.value
              );
              setCreateCommonData({
                city_id: e.target.value as number,
                city: selectedCity?.name || "",
              });
            }}
          >
            {availableCities.map((city) => (
              <MenuItem key={city.id} value={city.id}>
                {city.name}
              </MenuItem>
            ))}
          </Select>
        </FormControl>

        <div className="w-full flex flex-col gap-4 max-w-[300px] mx-auto">
          <ImageUploadCard
            title="Иконка остановки"
            imageKey="thumbnail"
            imageUrl={effectiveIconUrl}
            onImageClick={() => {
              setIsPreviewMediaOpen(true);
              setMediaId(effectiveIconUrl ?? "");
            }}
            onDeleteImageClick={() => {
              setCreateCommonData({ icon: "" });
              setActiveMenuType(null);
            }}
            onSelectFileClick={() => {
              setActiveMenuType("image");
              setIsSelectMediaOpen(true);
            }}
            setUploadMediaOpen={() => {
              setIsUploadMediaOpen(true);
              setActiveMenuType("image");
            }}
          />
        </div>

        <Button
          variant="contained"
          className="w-min flex gap-2 items-center"
          startIcon={<Save size={20} />}
          onClick={handleCreate}
          disabled={isLoading}
        >
          {isLoading ? (
            <Loader2 size={20} className="animate-spin" />
          ) : (
            "Создать"
          )}
        </Button>
      </div>

      {/* ИНТЕГРИРОВАННОЕ ПРЕДУПРЕЖДАЮЩЕЕ ОКНО */}
      <SelectMediaDialog
        open={isSelectMediaOpen}
        onClose={() => setIsSelectMediaOpen(false)}
        onSelectMedia={handleMediaSelect}
        mediaType={1}
      />

      <UploadMediaDialog
        open={isUploadMediaOpen}
        onClose={() => setIsUploadMediaOpen(false)}
        contextObjectName={createStationData[language].name || "Остановка"}
        contextType="station"
        afterUpload={handleMediaSelect}
        hardcodeType={activeMenuType}
      />

      <PreviewMediaDialog
        open={isPreviewMediaOpen}
        onClose={() => setIsPreviewMediaOpen(false)}
        mediaId={mediaId}
      />

      {isSaveWarningOpen && (
        <SaveWithoutCityAgree
          blocker={{
            proceed: handleConfirmCreate,
            reset: handleCancelCreate,
          }}
        />
      )}
    </Box>
  );
});
